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A kind of titanium silicon molecular sieve and its synthetic method and application and a kind of method of cyclic ketone oxidation

A titanium-silicon molecular sieve and synthesis method technology, applied in molecular sieve compounds, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of complex process, small grain size, insufficient reactivity, etc., and achieve improved selectivity and long service life. , the effect of good catalytic activity stability

Active Publication Date: 2019-12-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, follow-up research is devoted to the development of technologies for increasing the particle size of molecular sieves. For example, US5500199, US6106803 and US6524984, etc. use inorganic binders to gather small particle molecular sieves and then spray dry and granulate them to make the catalyst particles larger. The center is covered by the binder and the active components are diluted, resulting in insufficient reactivity and other problems
[0004] CN101696019B relates to a large block TS-1 molecular sieve with high catalytic activity and its synthesis method. The large block TS-1 molecular sieve has an MFI structure and is formed by stacking nanometer-level TS-1 grains, and the block size is larger. 20-100μm, the mesopore volume is 0.55cm 3 / g; with ethyl orthosilicate as silicon source, n-butyl titanate as titanium source, tetrapropylammonium hydroxide as template, water and isopropanol as solvent, H 2 o 2 It is synthesized by hydrothermal crystallization of inorganic additives, and the process is complicated
Although the obtained molecular sieve has high activity, the grain size is less than 1 μm

Method used

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  • A kind of titanium silicon molecular sieve and its synthetic method and application and a kind of method of cyclic ketone oxidation
  • A kind of titanium silicon molecular sieve and its synthetic method and application and a kind of method of cyclic ketone oxidation
  • A kind of titanium silicon molecular sieve and its synthetic method and application and a kind of method of cyclic ketone oxidation

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preparation example Construction

[0032] In the present invention, the purpose of the present invention can be achieved as long as the titanium silicate molecular sieve has the aforementioned characteristics. The synthesis method can be various, as long as the titanium silicate molecular sieve with the aforementioned characteristics can be synthesized. For the present invention, the titanium silicate is preferred. The silica molecular sieve is synthesized according to the following method, which includes:

[0033] In the presence of an aqueous solvent, the silicon source, titanium source and alkali source are mixed and then hydrothermally crystallized under airtight conditions to recover the titanium silicon molecular sieve; wherein the hydrothermal crystallization sequentially undergoes stages (1) and stages ( 2) and stage (3), stage (1) is crystallization at 80-120°C, stage (2) is heated to 180-220°C for crystallization, stage (3) is cooled to 140-180°C for crystallization.

[0034] According to a preferred embod...

Embodiment approach

[0037] According to a preferred embodiment of the present invention, the molar ratio of silicon source: titanium source: alkali source: water is 100: (0.5-5): (10-50): (500-5000), preferably 100: (2 -4): (15-35): (1000-3000) where the silicon source is SiO 2 Calculated, titanium source is TiO 2 Calculated, alkali source is N or OH - meter.

[0038] According to the method of the present invention, the water-containing solvent basically contains water, and a co-solvent can also be added as required. In the embodiment of the present invention, the water-containing solvent is water.

[0039] In the present invention, the silicon source may be an inorganic silicon source and / or an organic silicon source.

[0040] Specifically, the organosilicon source can be, for example, one or more selected from the silicon-containing compounds represented by formula I,

[0041]

[0042] In formula I, R 1 , R 2 , R 3 And R 4 Each C 1 -C 4 The alkyl group, including C 1 -C 4 The straight chain alkyl and ...

Embodiment 1

[0090] Add 20 grams of silicon source tetraethylorthosilicate into the tetrapropylammonium hydroxide aqueous solution and stir and mix uniformly, then add tetrabutyl titanate and mix uniformly to obtain the molar composition: silicon source: titanium source: alkali source: Water=100:2:15:1000 mixture. Place the mixture in a stainless steel sealed reaction kettle, raise the kettle temperature to 100°C at a heating rate of 2°C / min from room temperature and hydrothermally heat it for 24 hours at this temperature, then raise the kettle temperature to 190°C at a heating rate of 15°C / min And hydrothermally treat at this temperature for 6 hours; then reduce the temperature of the kettle to 170°C at a cooling rate of 10°C / min and hydrothermally treat it at this temperature for 48 hours. Finally, after cooling to room temperature and releasing the pressure, the product in the reactor is filtered, After washing, drying and calcination at 550°C for 5 hours, sample A of titanium silicate m...

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Abstract

The invention belongs to the field of titanium silicon molecular sieve, and more specifically provides a titanium silicon molecular sieve, and a synthetic method and applications thereof. The titaniumsilicon molecular sieve is composed of crystal particles with a particle size ranging from 5 to 200nm via aggregation; the particle size of the titanium silicon molecular sieve ranges from 0.3 to 5<mu>m; the I960 / I550 value ranges from 0.7 to 0.85. The invention also provides a cyclic ketone oxidation method. The cyclic ketone oxidation method comprises a step of contact of cyclic ketone, and anoxidizing agent with a catalyst. The catalyst contains the titanium silicon molecular sieve. The crystal of the titanium silicon molecular sieve is high in I960 / I550 value, and is large in effective framework ti content. When the titanium silicon molecular sieve is used in oxidation reaction, the catalytic oxidation activity, and the reaction product selectivity are increased obviously, and excellent catalytic stability is achieved. The titanium silicon molecular sieve is capable of realizing aggregation of small crystal particles in crystallization growth process instead of simple physical aggregation of the small crystal particles, and micron order is achieved.

Description

Technical field [0001] The invention relates to a titanium-silicon molecular sieve, a synthesis method and application thereof, and a method for oxidizing cyclic ketones. Background technique [0002] Titanium silicate molecular sieve is a new type of heteroatom molecular sieve developed in the early 1980s. Among them, the titanium silicalite TS-1 not only has the catalytic oxidation effect of titanium, but also has the shape-selective effect and excellent stability of ZSM-5 zeolite. Using titanium silicon molecular sieve as a catalyst can catalyze various types of organic oxidation reactions, such as epoxidation of alkenes, partial oxidation of alkanes, oxidation of alcohols, hydroxylation of phenols, and ammoxidation of cyclic ketones. As a catalyst for selective oxidation of organics, titanium-silica molecular sieve is considered a milestone in the field of molecular sieve catalysis. [0003] However, according to classic methods such as the method in US4410501, the particle s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B37/00B01J29/89B82Y30/00
Inventor 史春风林民朱斌
Owner CHINA PETROLEUM & CHEM CORP
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